Calculate time in between to date and time in laravel

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use Carbon\Carbon;

use DateTimeInterface;

  $starTime =$data->check_in_time; //dynamic value

        // This is for start date by backend

        $stopTime =Carbon::now();

        // It is of diffence of time

        $t1 = strtotime($starTime);

        $t2 = strtotime($stopTime);

        $hours = ($t2 - $t1)/3600;

        $calculationTime= floor($hours) . ' Hour ' . floor( ($hours-floor($hours)) * 60 ).' Minutes';